This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 19 |
| 3 | 313 |
| 4 | 5035 |
| 5 | 80641 |
| 6 | 1290499 |
| 7 | 20648713 |
| 8 | 330381595 |
| 9 | 5286112081 |
| 10 | 84577812979 |
| 11 | 1353245066713 |
| 12 | 21651921244555 |
| 13 | 346430740444321 |
| 14 | 5542891848703459 |
| 15 | 88686269584038313 |
| 16 | 1418980313358961915 |